var exec = require("child_process").exec
// var queryString = require('queryString')
var fs = require('fs')
var formidable = require('formidable')

function start(response) {
    console.log("Request handler 'start' was called.");
    var body = '<html>' +
        '<head>' +
        '<meta http-equiv="Content-Type" content="text/html; ' + 'charset=UTF-8" />' +
        '</head>' +
        '<body>' +
        '<form action="/upload" enctype="multipart/form-data" ' + 'method="post">' +
        '<input type="file" name="upload" multiple="multiple">' + '<input type="submit" value="Upload file" />' + '</form>' +
        '</body>' +
        '</html>';
    response.writeHead(200, {
        "Content-Type": "text/html"
    });
    response.write(body);
    response.end();
}

function upload(response, request) {
    console.log("Request handler 'upload' was called.");
    var form = new formidable.IncomingForm();
    console.log("about to parse");
    form.parse(request, function (error, fields, files) {
        console.log("parsing done");
        fs.renameSync(files.upload.path, "/tmp/test.png");
        response.writeHead(200, {
            "Content-Type": "text/html"
        });
        response.write("received image:<br/>");
        response.write("<img src='/show' />");
        response.end();
    });
}

function show(response, request) {
    console.log("Request handler 'show' was called.");
    fs.readFile("/tmp/test.png", "binary", function (error, file) {
        if (error) {
            response.writeHead(500, {
                "Content-Type": "text/plain"
            });
            response.write(error + "\n");
            response.end();
        } else {
            response.writeHead(200, {
                "Content-Type": "image/png"
            });
            response.write(file, "binary");
            response.end();
        }
    });
}

exports.start = start

exports.upload = upload

exports.show = show